Last



Oct. 15, 1929. usmc-z 1,731,613

' LAST Filed April 22, 1925 ATTORNEYS Patented Oct. 15, 1929 UNITEDSTATES.-

PATENroFFIcE GEORGE CLAUSING, OF PORTSMOUTH, OHIO, ASSIGNOR, BY MESNEASSIGNMENTS, TO V'U'LCAN CORPORATION, OF PORTSMOUTH, OHIO, A CORPORATIONOF OHIO LAST Application filed April 22, 1925. Serial No, 24,993.

My invention relates to lasts and in particular to snap back lasts.

It is the object of my invention to provide a snap back last which willhave the maximum of snap action possible within the limited area of alast.

It is a further object of my invention to provide such a last with apositive means of attachment of the last parts to one another.

Referring to the drawings:

Figure 1 is a side elevation of the last partially in section cut awayto show the arrangement of the links and spring; and

Figure 2 is a plan view of the arrangement of springs and link.

Referring to the drawings in detail, 1 is the toe part of the last and 2is the heel part. The toe part has a cut away portion 3 which isrelatively deep to accommodate the full arch of the spring 4 which alsoprojects into the cut away portion 5 of the heel part 2. Near the bottomof these cut away portions relatively close to the bottom of the lastparts are transverse anchor pins 6 and 7. The last parts are limited intheir expanding movement by their adjacent shoulders 8 and 9. The lastparts are further limited in their collapsing movement by their normallyspaced faces 10 and 11 which form a V- shaped space between the lastparts when in their expanded position. The forward half of the last'hasa transverse semi-circular groove 12 to receive a correspondingtransversely located partially circular shoulder 13 of the heel part.The center of this shoulder is occupied by a transverse hinge pin 14,the center of which is the center of movementof the parts one about theother. Mounted on this hinge pin are aipair of spaced links 15 the freeends of which are connected to the anchor pin 7 Other'links 16 arepivoted on the hinge pin 14 and are mounted on the heel anchor pin 6. Aline drawn over the centers of the pins 6 and 7 never passes over thecenter of the pin 14.

I An elliptical spring having a high arch such as the spring 4 has itsends 17 hooked over the outside of the anchor pins 6 and 7, thus givingthe maximum of spring and snap action within the limited area for such aconstruction in a last.

It will be understood that I desire to comprehend within my inventionsuch modifications as may be necessary to adapt it to varying conditionsof use.

Having thus fully described my invention, what'I claim as new and desireto secure by Letters Patent, is

1. In a snap back last, a toe part and heel part adapted to rock one onthe other, :a toggle joint consisting of links pivoted on the center ofmovement of said last having the free ends pivoted to the respectivelast halves, pins supporting the free ends of the links and a clampingmeans engaging over and under said pins adaptedto yieldingly maintainsaid last parts in expanded position and to resist their movement tocollapsing position.

2. In a snap back last, a toe part and heel part adapted to rock one onthe other, a toggle oint consisting of links pivoted on the center ofmovement of said last having the free ends pivoted to the respectivelast halves, pins supporting the free ends of the links and a clampingspring extending over and engaging said pins adapted to yieldinglymaintain said last parts in expanded position and to resist theirmovement to collapsing position, said links being arranged in spacedpairs with said spring therebetween.

3. In a snap back last, a toe part and heel part adapted to rock one onthe other,'

a toggle joint consisting of links pivoted on the center of movement ofsaid last having the free ends pivoted to the respective last halves,pins supporting the free ends of the links and a semi-circular clampingspring having inwardly bent portions hooked over the outside of saidpins adapted to yieldingly maintain said last parts in expanded positionand to resist their movement to collapsing position said links beingarranged in spaced pairs With said spring therebetween, the centers ofsaid pins carrying said spring being so arranged that a line drawntherebetween never passes over the center of movement of the last parts.

In testimony whereof, I afiix my signature.

GEORGE CLAUSING.

